As for the whole gifted adult thing. I'd say Dh and myself are doing pretty well. Our field is pretty gifted stacked (actually, I don't know anybody in it who was not at least MG growing up). Almost all our friends are from work, which is great because I can talk to them about DD. Unfortunately, our field is highly competitive and most people don't have kids, so it also means they rarely have advice.
DH is pretty much 110% focused on work whereas I'm always off in the boonies. I kind of flirt with different interests over time to keep my mind occupied. Because my interests are so diverse I kept having to stop myself from quitting and going back to school to get a second PhD. I know I'd love it but I do need to bring home a paycheck at some point, right? For instance, right now I'm big on the whole child development reseach while also reading those Percy Jackson books during DD's naps.

During my pregnancy, I was convinced I was going to go to med school and become an OB/GYN. Sometimes I think my life would be MUCH easier if I didn't have so many interests!!
From HS on I've never had problems making friend but then again I have friends for a lot of different activities. I'd have sport friends, music friends etc. I also was lucky enough to be in a great HS that had tons of options for gifted students (lots, and lots of AP classes, ability grouping, grade acceleration, dual enrollment, etc.) so I was able to have intellectual peers as friends too.
DH is the same way with friends. He's VERY extroverted and has quite a bit in common with Kirk. Ironically, he's a huge Spock fan! Speaking of which, what did you guys think of the newest movie?